1973 USAMO Problems/Problem 1
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Problem
Two points 
and 
lie in the interior of a regular tetrahedron 
. Prove that angle 
.
Solution
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See also
| 1973 USAMO (Problems) | ||
| Preceded by First Question | 1 • 2 • 3 • 4 • 5 | Followed by Problem 2 |
| All USAMO Problems and Solutions | ||
